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The CI series external wall system is ideal for installing sealed gas and oil-fired boilers with a maximum flue gas temperature of 120°C (condensing boilers). You can be confident that there will be no corrosion or ice formation. The CI series external wall system is also very easy to install. You will undoubtedly appreciate the system's simplicity and the solid result. The flue pipe is made of durable PP plastic, and the outer casing is mirror-polished stainless steel. This is an attractive material and ideal for professionals. The extensive package of smart accessories will help you install the chimney system.